| | | | |
|  Croatia |  Austria | |
|
|
RANK 23 | Borna Coric | 6-3 7-5 | Dennis Novak | RANK 144 |
RANK 121 | Borna Gojo | 6-3 7-6(2) | Dominic Thiem | RANK 99 |
| Ivan Dodig / Nikola Mektic | 3-6 6-7(11) | Alexander Erler / Lucas Miedler | |
RANK 23 | Borna Coric | 7-6(3) 6-2 | Dominic Thiem | RANK 99 |
RANK 144 | Dennis Novak | NOT PLAYED | Borna Gojo | RANK 121 |
| | | | |
| | | | |
|  Hungary |  France | |
|
|
RANK 182 | Zsombor Piros | 7-6(4) 6-3 | Benjamin Bonzi | RANK 45 |
RANK 71 | Marton Fucsovics | 3-6 2-6 | Ugo Humbert | RANK 86 |
| Fabian Marozsan / Mate Valkusz | 6-2 7-6(4) | Nicolas Mahut / Arthur Rinderknech | |
RANK 71 | Marton Fucsovics | 6-7(6) 2-6 | Adrian Mannarino | RANK 58 |
RANK 86 | Ugo Humbert | 6-3 6-3 | Fabian Marozsan | RANK 161 |
| | | | |
| | | | |
|  Uzbekistan |  United States | |
|
|
RANK 366 | Sergey Fomin | 4-6 1-6 | Mackenzie McDonald | RANK 63 |
RANK 480 | Khumoyun Sultanov | 1-6 6-7(6) | Tommy Paul | RANK 19 |
| Sanjar Fayziev / Sergey Fomin | 2-6 4-6 | Austin Krajicek / Rajeev Ram | |
RANK 63 | Mackenzie McDonald | NOT PLAYED | Khumoyun Sultanov | RANK 480 |
| | | | |
| | | | |
|  Germany |  Switzerland | |
|
|
RANK 80 | Oscar Otte | 6-2 2-6 4-6 | Marc-Andrea Huesler | RANK 53 |
RANK 14 | Alexander Zverev | 6-4 6-1 | Stan Wawrinka | RANK 135 |
| Andreas Mies / Tim Puetz | 6-7(3) 6-3 6-4 | Dominic Stephan Stricker / Stan Wawrinka | |
RANK 53 | Marc-Andrea Huesler | 6-2 7-6(4) | Alexander Zverev | RANK 14 |
RANK 135 | Stan Wawrinka | 6-3 5-7 6-4 | Daniel Altmaier | RANK 91 |
| | | | |
| | | | |
|  Colombia |  Great Britain | |
|
|
RANK 253 | Nicolas Mejia | 6-2 2-6 6-4 | Daniel Evans | RANK 30 |
RANK 510 | Nicolas Barrientos | 2-6 5-7 | Cameron Norrie | RANK 11 |
| Juan-Sebastian Cabal / Robert Farah | 4-6 4-6 | Daniel Evans / Neal Skupski | |
RANK 253 | Nicolas Mejia | 4-6 4-6 | Cameron Norrie | RANK 11 |
RANK 30 | Daniel Evans | NOT PLAYED | Nicolas Barrientos | RANK 510 |
| | | | |
| | | | |
|  Norway |  Serbia | |
|
|
RANK 1265 | Andreja Petrovic | 1-6 3-6 | Miomir Kecmanovic | RANK 34 |
RANK 362 | Viktor Durasovic | 3-6 6-4 6-7(8) | Laslo Djere | RANK 65 |
| Viktor Durasovic / Herman Hoeyeraal | 4-6 6-3 3-6 | Nikola Cacic / Filip Krajinovic | |
RANK 362 | Viktor Durasovic | 4-6 7-6(4) 4-10 | Hamad Medjedovic | RANK 258 |
RANK 1265 | Andreja Petrovic | NOT PLAYED | Laslo Djere | RANK 65 |
| | | | |
| | | | |
|  Chile |  Kazakhstan | |
|
|
RANK 102 | Cristian Garin | 1-6 3-6 | Timofei Skatov | RANK 129 |
RANK 126 | Nicolas Jarry | 6-2 6-2 | Alexander Bublik | RANK 36 |
| Marcelo Tomas Barrios Vera / Alejandro Tabilo | 6-4 7-5 | Andrey Golubev / Aleksandr Nedovyesov | |
RANK 102 | Cristian Garin | 6-4 3-6 6-3 | Alexander Bublik | RANK 36 |
RANK 129 | Timofei Skatov | NOT PLAYED | Nicolas Jarry | RANK 126 |
| | | | |
| | | | |
|  South Korea |  Belgium | |
|
|
RANK 61 | Soonwoo Kwon | 6-1 4-6 6-7(6) | Zizou Bergs | RANK 115 |
RANK 237 | Seong Chan Hong | 4-6 2-6 | David Goffin | RANK 41 |
| Ji Sung Nam / Min-Kyu Song | 7-6(3) 7-6(5) | Sander Gille / Joran Vliegen | |
RANK 61 | Soonwoo Kwon | 3-6 6-1 6-3 | David Goffin | RANK 41 |
RANK 115 | Zizou Bergs | 3-6 6-7(4) | Seong Chan Hong | RANK 237 |
| | | | |
| | | | |
|  Sweden |  Bosnia and Herzegovina | |
|
|
RANK 60 | Mikael Ymer | 6-4 7-5 | Mirza Basic | RANK 394 |
RANK 120 | Elias Ymer | 6-1 6-4 | Damir Dzumhur | RANK 197 |
| Andre Goransson / Elias Ymer | 4-6 2-6 | Mirza Basic / Tomislav Brkic | |
RANK 60 | Mikael Ymer | 6-1 1-6 6-3 | Damir Dzumhur | RANK 197 |
RANK 394 | Mirza Basic | NOT PLAYED | Elias Ymer | RANK 120 |
| | | | |
| | | | |
|  Netherlands |  Slovakia | |
|
|
RANK 59 | Tallon Griekspoor | 7-6(6) 2-6 6-4 | Lukas Klein | RANK 143 |
RANK 107 | Tim Van Rijthoven | 7-6(6) 5-7 6-3 | Alex Molcan | RANK 55 |
| Wesley Koolhof / Matwe Middelkoop | 6-3 6-3 | Lukas Klein / Alex Molcan | |
RANK | Matwe Middelkoop | 6-4 6-4 | Jozef Kovalik | RANK 134 |
RANK 143 | Lukas Klein | NOT PLAYED | Tim Van Rijthoven | RANK 107 |
| | | | |
| | | | |
|  Finland |  Argentina | |
|
|
RANK 43 | Emil Ruusuvuori | 7-5 6-3 | Pedro Cachin | RANK 68 |
RANK 181 | Otto Virtanen | 3-6 6-3 6-7(3) | Francisco Cerundolo | RANK 31 |
| Harri Heliovaara / Emil Ruusuvuori | 7-6(5) 4-6 6-4 | Maximo Gonzalez / Andres Molteni | |
RANK 43 | Emil Ruusuvuori | 7-5 6-1 | Facundo Bagnis | RANK 88 |
RANK 68 | Pedro Cachin | NOT PLAYED | Otto Virtanen | RANK 181 |
| | | | |
| | | | |
|  Portugal |  Czech Republic | |
|
|
RANK 105 | Nuno Borges | 4-6 4-6 | Jiri Lehecka | RANK 39 |
RANK 84 | Joao Sousa | 6-7(6) 6-3 2-6 | Tomas Machac | RANK 122 |
| Nuno Borges / Francisco Cabral | 7-5 7-6(4) | Tomas Machac / Adam Pavlasek | |
RANK 39 | Jiri Lehecka | 6-4 6-1 | Joao Sousa | RANK 84 |
RANK 105 | Nuno Borges | NOT PLAYED | Tomas Machac | RANK 122 |
RANK 105 | Nuno Borges | NOT PLAYED | Tomas Machac | RANK 122 |
| | | | |